The towers of perdition yes, where there were the roaming spells and where richard got his sorcerer sand. There should be some left even if they were all destroyed, after all he only destroyed the towers themselves, the sand would still remain, since as his father showed, the sand can lay innert indefinately without being used.
EDIT: i havn't gotten as far as chainfire :S i got bored of the monotany of realism before than
EDIT: i havn't gotten as far as chainfire :S i got bored of the monotany of realism before than